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EP0378520A1 - Soupape sphérique avec anneau de fixation dans deux directions - Google Patents

Soupape sphérique avec anneau de fixation dans deux directions Download PDF

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Publication number
EP0378520A1
EP0378520A1 EP90830007A EP90830007A EP0378520A1 EP 0378520 A1 EP0378520 A1 EP 0378520A1 EP 90830007 A EP90830007 A EP 90830007A EP 90830007 A EP90830007 A EP 90830007A EP 0378520 A1 EP0378520 A1 EP 0378520A1
Authority
EP
European Patent Office
Prior art keywords
ring
valve body
plug
flange
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90830007A
Other languages
German (de)
English (en)
Other versions
EP0378520B1 (fr
Inventor
Andrea Catanzano
Gian Luca Tropea
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FIP Formatura Iniezione Polimeri SpA
Original Assignee
FIP Formatura Iniezione Polimeri SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FIP Formatura Iniezione Polimeri SpA filed Critical FIP Formatura Iniezione Polimeri SpA
Publication of EP0378520A1 publication Critical patent/EP0378520A1/fr
Application granted granted Critical
Publication of EP0378520B1 publication Critical patent/EP0378520B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/08—Details
    • F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
    • F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
    • F16K5/201—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces with the housing or parts of the housing mechanically pressing the seal against the plug
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0663—Packings
    • F16K5/0673—Composite packings
    • F16K5/0678—Composite packings in which only one of the components of the composite packing is contacting the plug

Definitions

  • Ball valves consisting of a substantially cylindrical body and a ball-shaped plug, holed and the closing or opening of which is controlled by a handle through a stem are known.
  • the valve body has on one side a sort of flange facing in­wards and which acts as a beat for a ring-shaped gasket which on the other side rests on the ball-type plug.
  • the second ring-shaped gasket for the ball-type plug is supported by a supporting bushing in­serted inside the body of the valve.
  • the flanged ends of the pipes connected to the valve are tightened against the ends of the valve body by means of tightenable ring nuts screwed onto the outer surfaces of the valve body.
  • This type of arrangement allows the valve to be removed in order to check the state of wear of the gaskets without dismantling the two pipes connected to the valve. In some cases, however, it may be necessary to dismantle the pipe connected downstream from the valve, with the valve closed, while there is still fluid under pressure in the other pipe, upstream from the valve. This requirement forces the valve to be arranged in such a way that the bushing supporting the gasket is always positioned on the upstream side, in respect of the pressure. If this is not done, said bushing, the relevant gasket and the ball-type plug itself might be forced out of the valve body by the pressure existing on the other side of the valve.
  • a ball valve of the type described is equipped with a bi-directional lock ring allowing disassembly of the pipe downstream from the valve, with the valve closed, without prejudice for the valve's sealing, which is capable of absorbing possible axial loads due to expansion of the pipes.
  • 10 is the body or housing of the valve, which has a basi­cally cylindrical outer shape 11, and at its two ends has threaded parts 12, 13 for two tightenable ring nuts 20, 20′.
  • Each of said ring nuts 20 and 20′ has a tubular part 21, 21′ fitted internally with a threaded part suitable for engaging the threads 12 and 13, and at one end each has a flange 23, 23′ facing the inside of the ring nut and the purpose of which is to engage the outer flanges 31, 31′ of the pipes 30, 30′.
  • each pipe 30, 30′ may made in one piece with its outer flange 31, 31′; in a known manner, in most cases the pipe 30, 30′ consists of a tube 32, 32′ engaged inside an end bushing 33, 33′ fitted with said outer flange 31, 31′.
  • the tube 32, 32′ may be joined to the end bushing 33, 33′ in different ways: they may be screwed to one another, bonded or welded.
  • the valve body 10 has at one end, on the left-hand side in the figures, a bore 14 extending as far as the central part of the valve body. At the other end, on the right-hand side of the figure, said bore is partly closed by a ring-shaped flange 15, facing towards the axis of the valve body, and which acts as a beat for the front end 34 of the pipe 30. Said front end 34 of the pipe 30 rests on the front end 16 of the valve body.
  • valve body 10 in the front surface 16 of the valve body, located against the internal flange 15, there is a ring-shaped groove 17, capable of housing a sealing O-ring.
  • the valve body 10 is equipped with a radial hole for the control stem 40 of the plug 41, consisting of a ball with a diametrical hole 42 and having an im­ pression capable of accommodating a cylindrical spigot 44 with a non-circular cross-section, protruding from the bottom of the stem 40.
  • the valve has, in this order, the following known elements: the pipe 30, the flange 15 of the valve body 10, the sealing gasket 45, the ball-shaped plug 41, the sealing gasket 45′, the bushing 50 supporting said gasket, and the pipe 30′.
  • the tightenable ring nuts 20 and 20′ also typical of these known ball valves.
  • the end of the bore 14 op­posite to the flange 15 has an inner thread 60 capable of engaging an externally threaded lock ring 61 equipped with two impressions, diametrically opposite to one another and not shown in the figure, allowing it to be rotated by means of a suitable tool.
  • an externally threaded lock ring 61 equipped with two impressions, diametrically opposite to one another and not shown in the figure, allowing it to be rotated by means of a suitable tool.
  • a ring-shaped groove 52 In order to allow the lock ring 61 to fit, on the outer surface of the supporting bushing 50 there is a ring-shaped groove 52.
  • the lock ring 61 has a thread 62 suitable to engage the internal thread 60 of the bore 14.
  • the axial width of the lock ring 61 is smaller than the axial width of the groove 52.
  • the lock ring 61 allows the valve to be fitted in any position in relation to the flow direction of the li­quid, in case either one of the pipes 30 or 30′ has to be disassembled with the valve closed. Indeed, if the flow direction of the fluid passing through the valve is the direction indicated by the arrow F1 in figure 1, on closing the valve by turning the ball-shaped plug 41, it is possible, if required, to disassemble the downstream pipe 30′ with no risk of the bushing 50 sup­porting the gasket 45′ being expelled from the valve body; this is achieved by means of the lock ring 61 screwed into the thread 60 of the valve body 10.
  • Axial positioning of the supporting bushing 50 is defined by the extent to which the lock ring 61 is screwed into the thread 60. If the lock ring 61 is screwed in by means of a calibrated tool, it is pos­sible to gauge the axial strength with which the two ring-shaped gaskets 45 and 45′ are pressed against the plug 41. Then the pipe 30, formed by the pipe 32′ and the end-bushing 33′ is placed against the outer end surface 51 of the supporting bushing 50.
  • valves may leave the workshop with the gaskets com­pressed to the exact required values, and subsequent assembly of the pipes 30 and 30′ and of the ring nuts 20 and 20′, even if carried out by less qualified per­sonnel, cannot alter arbitrarily the degree of compres­sion of the gaskets 45 and 45′.
  • valve claimed here may be used in environ­ments subject to extreme temperature changes. This means that the pipes may undergo heat-dependent expan­sion and compression. Usual valves prevent loosening of the gaskets 45 and 45′ consequent to contraction of the pipes thanks to the presence of the ring nuts 20 and 20′. They are, however, not capable of preventing posi­tive heat expansion from causing the undesired compres­ sion of said sealing gaskets 45 and 45′.
  • the invention provides the following ad­vantages: On the one hand it allows the correct compression of the gaskets 45 and 45′ to be established once and for all at the time of assembly of the valve. At the time of tightening ring nuts 20 and 20′, this compression cannot be increased beyond the extent allowed by the clearance (g). It is worthwhile to stress that, depend­ing on the type of plant in which the valve is in­stalled, the value of the clearance (g) may be varied by altering the axial height of that part of the ring 61 which is housed inside the groove 52. For the same purpose, it is possible, vice versa, to vary the axial length of the groove 52. On the other hand, the lock ring 61 contrasts any positive heat expansion which might otherwise cause excessive tightening of the gas­kets 45 and 45′, which might even cause the valve to jam.
  • the internal end of the flange 15 extends towards the end of the valve body (20) in the form of a cylindrical flange 70 to create a ring-shaped opening 71 facing towards the outside of the valve. It is in the front end 16 of this cylindri­cal flange 70 that groove 17 is made. Groove 17 is capable of holding a sealing O-ring similar to or similarly positioned to the O-ring resting in the groove 17′ of the supporting bushing 50.
  • the annular space 71 makes it pos­sible to construct a valve body with thicknesses of the same order of size, and this reduces wastages if the piece is obtained by casting or forming.
  • the gaskets 45 and 45′ are usually contained in a ring-shaped step; these gaskets have a practically trapezoid-shaped cross-section.
  • This ring-­shaped step has, therefore, in the known manner, a first cylindrical beating surface 82 and a second flat beating surface 83 in the shape of a circular rim. It follows that sealing of the gasket and the adaptability of the sliding surface against the outer surface of the ball-shaped plug 41 depend solely on the elastic characteristics of the material of the gasket.
  • the flat beating surface 83 in the shape of a circular rim has a ring-shaped groove 84 containing an O-ring. In this way the gasket 45, 45′ acquires a greater elas­ticity due to the presence of the O-ring.
  • gaskets 45 and 45′ are made of material having a low coefficient of friction, so as to facilitate rotation of the plug without increasing the tightening effort. Since a second source of fric­tion is the torque developed by the sliding of the con­taining flange 49 of the stem 40 against the cor­responding seat in the body of the valve 10, between said seat and said flange there is a washer made of an­tifriction material 48.
  • the valve according to the invention prevents tighten­ing pressures in excess of pre-established levels from being exerted on the gaskets 45 and 45′; on the other hand, at the same torque judged to be the best for rotating the plug 41, the tightening effort may be in­creased in order to improve the sealing capability of the valve, thanks to the presence of antifriction material for the gaskets 45 and 45′ and for the washer 48.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Taps Or Cocks (AREA)
  • Valve Housings (AREA)
EP90830007A 1989-01-13 1990-01-05 Soupape sphérique avec anneau de fixation dans deux directions Expired - Lifetime EP0378520B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1240789 1989-01-13
IT8912407A IT1232458B (it) 1989-01-13 1989-01-13 Valvola a sfera con anello di arresto bidirezionale

Publications (2)

Publication Number Publication Date
EP0378520A1 true EP0378520A1 (fr) 1990-07-18
EP0378520B1 EP0378520B1 (fr) 1995-08-09

Family

ID=11139805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90830007A Expired - Lifetime EP0378520B1 (fr) 1989-01-13 1990-01-05 Soupape sphérique avec anneau de fixation dans deux directions

Country Status (3)

Country Link
EP (1) EP0378520B1 (fr)
DE (1) DE69021401T2 (fr)
IT (1) IT1232458B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU644410B2 (en) * 1990-04-02 1993-12-09 Nefit Industrial BV Ball-cock
CN103711935A (zh) * 2012-10-05 2014-04-09 上海神通企业发展有限公司 一种轨道球阀阀座结构
CN111322424A (zh) * 2020-04-07 2020-06-23 贵州高峰石油机械股份有限公司 一种双向圆柱簧旋塞阀
IT201900024129A1 (it) * 2019-12-16 2021-06-16 Petrolvalves S P A Valvola con otturatore mobile

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11131404B2 (en) 2015-11-16 2021-09-28 Hayward Industries, Inc. Ball valve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568510A5 (fr) * 1973-10-19 1975-10-31 Whitey Research Tool Co
EP0051993A1 (fr) * 1980-11-10 1982-05-19 Nibco Inc. Robinet à boisseau sphérique à boisseau verrouillé
DE3321819C1 (de) * 1983-06-16 1984-07-26 Werner Dipl.-Ing. 3167 Burgdorf Hartmann Hahn mit kugelfoermigem Kueken
US4605199A (en) * 1983-10-04 1986-08-12 F.I.P. Formatura Iniezione Polimeri, S.P.A. Ball valve provided with a lock ring

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH666103A5 (de) * 1985-05-13 1988-06-30 Fischer Ag Georg Absperrhahn mit kugelfoermigem kueken.
US4684105A (en) * 1985-11-21 1987-08-04 Haas Ii Carroll J Ball valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568510A5 (fr) * 1973-10-19 1975-10-31 Whitey Research Tool Co
EP0051993A1 (fr) * 1980-11-10 1982-05-19 Nibco Inc. Robinet à boisseau sphérique à boisseau verrouillé
DE3321819C1 (de) * 1983-06-16 1984-07-26 Werner Dipl.-Ing. 3167 Burgdorf Hartmann Hahn mit kugelfoermigem Kueken
US4605199A (en) * 1983-10-04 1986-08-12 F.I.P. Formatura Iniezione Polimeri, S.P.A. Ball valve provided with a lock ring

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU644410B2 (en) * 1990-04-02 1993-12-09 Nefit Industrial BV Ball-cock
CN103711935A (zh) * 2012-10-05 2014-04-09 上海神通企业发展有限公司 一种轨道球阀阀座结构
CN103711935B (zh) * 2012-10-05 2017-03-29 上海神通企业发展有限公司 一种轨道球阀阀座结构
IT201900024129A1 (it) * 2019-12-16 2021-06-16 Petrolvalves S P A Valvola con otturatore mobile
WO2021123980A1 (fr) * 2019-12-16 2021-06-24 Petrolvalves S.P.A. Soupape ayant un obturateur mobile
CN115038899A (zh) * 2019-12-16 2022-09-09 石油阀门有限责任公司 带可移动闸门的阀
US11725740B2 (en) 2019-12-16 2023-08-15 Petrolvalves S.P.A. Valve with movable shutter
CN111322424A (zh) * 2020-04-07 2020-06-23 贵州高峰石油机械股份有限公司 一种双向圆柱簧旋塞阀

Also Published As

Publication number Publication date
EP0378520B1 (fr) 1995-08-09
IT8912407A0 (it) 1989-01-13
DE69021401D1 (de) 1995-09-14
IT1232458B (it) 1992-02-17
DE69021401T2 (de) 1996-02-01

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